CN111963453B - Self-priming performance test system and test method for self-priming pump - Google Patents
Self-priming performance test system and test method for self-priming pump Download PDFInfo
- Publication number
- CN111963453B CN111963453B CN202010728474.3A CN202010728474A CN111963453B CN 111963453 B CN111963453 B CN 111963453B CN 202010728474 A CN202010728474 A CN 202010728474A CN 111963453 B CN111963453 B CN 111963453B
- Authority
- CN
- China
- Prior art keywords
- self
- priming
- water
- pump
- height
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a self-priming performance test system and a test method of a self-priming pump, comprising the following steps: a self-suction height test well; the water suction pipe extends upwards from the bottom of the self-priming height test well and is communicated with a water inlet of the self-priming pump; the liquid level sensor is arranged above the self-suction height test well to monitor the liquid level position in the self-suction height test well; the top of the water tank is communicated with the self-absorption height testing well through an upper water pipe, and the side part of the water tank is communicated with the self-absorption height testing well through a lower water pipe so as to adjust the water level in the self-absorption height testing well.
Description
Technical Field
The invention belongs to the technical field of self-priming pump testing, and particularly relates to a self-priming performance testing system and a self-priming performance testing method for a self-priming pump.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The self-priming pump does not need to be filled with water before starting, and can suck water up by the action of the pump after running for a short time so as to be put into normal operation.
The working principle of the self-priming pump is as follows: before starting, a certain amount of water is stored in the pump shell, and after the pump is started, air sucked into the pipeline and water are fully mixed under the rotating action of the impeller and are discharged to the air-water separation chamber. The gas at the upper part of the gas-water separation chamber is discharged, the liquid at the lower part returns to the impeller again and is mixed with the gas in the suction pipeline until the gas in the pump and the suction pipeline is completely discharged, so that self-suction is completed, and normal water pumping is realized.
According to the standard specification requirement of the self-priming pump, the specified self-priming height and the specified self-priming time of the self-priming pump are measured. The inventor finds that no test device for quickly and effectively automatically measuring the specified self-priming height and the self-priming time of the self-priming pump exists at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a self-priming performance test system and a test method for a self-priming pump.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a self-priming performance testing system for a self-priming pump, including:
a self-suction height test well;
the water suction pipe extends upwards from the bottom of the self-priming height test well and is communicated with a water inlet of the self-priming pump;
the liquid level sensor is arranged above the self-suction height test well to monitor the liquid level position in the self-suction height test well;
the top of the water tank is communicated with the self-suction height testing well through an upper water pipe, and the side part of the water tank is communicated with the self-suction height testing well through a lower water pipe so as to adjust the water level in the self-suction height testing well.
As a further technical scheme, the upper water pipe comprises an upper water pipe I communicated with the water tank, the upper water pipe I is communicated with an upper water pipe II, and the upper water pipe II extends to the bottom of the self-absorption height testing well.
As a further technical scheme, a submersible pump is arranged at the bottom of the water feeding pipe II and is communicated with the controller.
As a further technical scheme, the water feeding pipe I is provided with an electric flow regulating valve I, and the electric flow regulating valve I is communicated with the controller.
As a further technical scheme, the sewer pipe is provided with an electric flow regulating valve II, and the electric flow regulating valve II is communicated with the controller.
As a further technical scheme, the device also comprises a discharge pipe, wherein the discharge pipe is communicated with a water outlet of the self-sucking pump, and the discharge pipe is communicated with the water tank through an observation pipe.
As a further technical scheme, the observation pipe is provided with a manual flow regulating valve; the discharge pipe is also communicated with a water return pipe, and the water return pipe extends to the bottom of the self-absorption height testing well.
As a further technical scheme, the self-priming pump further comprises a rotating speed sensor, wherein the rotating speed sensor is connected with the self-priming pump and is communicated with a controller so as to monitor the rotating speed of the self-priming pump; the level sensor is also in communication with the controller.
In a second aspect, an embodiment of the present invention further provides a testing method using the self-priming performance testing system of the self-priming pump, including the following steps:
setting a self-priming height h, and obtaining the distance hi from the pump shaft of the self-priming pump to the liquid level of a self-priming height test well according to the monitoring value of the liquid level sensor;
comparing hi with h, starting the self-sucking pump when hi is within the range of h +/-a set value, starting timing when the self-sucking pump reaches a rated rotating speed, measuring hi again, stopping timing if the self-sucking pump discharges water when hi is within the range of h +/-the set value again, obtaining self-sucking time of the self-sucking height, and stopping the self-sucking pump;
increasing the value of the self-suction height h, repeating the above process, and performing a second self-suction height self-suction time measurement; the self-sucking pump is cycled in a reciprocating way and is tested for many times until the self-sucking pump can not discharge water, and the self-sucking pump is stopped;
and drawing a self-priming performance curve of the self-priming pump by taking the self-priming time as an abscissa and the self-priming height as an ordinate.
As a further technical scheme, if hi is not within the range of h +/-a set value, pumping water from the self-priming height test well by a water tank or supplementing water to the self-priming height test well so as to adjust the liquid level height of the self-priming height test well; the maximum self-priming height of the self-priming pump is the maximum h value in the test of water discharge.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
the testing system provided by the invention has the advantages that the self-priming pump can be ensured to normally work by the arrangement of the self-priming height testing well and the communication between the water suction pipe and the self-priming pump, the liquid level height of the self-priming height testing well can be automatically monitored by the arrangement of the liquid level sensor, the testing is further carried out, the automation degree is high, the operation is convenient, the higher testing precision is ensured, and the self-priming performance testing of the self-priming pump is effectively carried out.
The testing system provided by the invention has the advantages that the water tank, the upper water pipe and the lower water pipe are matched with the liquid level sensor, water can be pumped or supplemented to the self-priming height testing well, the liquid level height is further automatically adjusted, and the stability of the liquid level height during the self-priming test is maintained.
The testing method can automatically measure the specified self-priming height and the self-priming time of the self-priming pump, automatically draw the self-priming performance curve of the tested pump, has high automatic operation degree, and can complete the measurement of the self-priming time under different self-priming heights by adjusting different self-priming heights.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a test system according to one or more embodiments of the invention;
FIG. 2 is a schematic flow diagram of a testing method according to one or more embodiments of the invention;
in the figure: 1. a suction pipe; 2. a rotational speed sensor; 3. a self-priming pump; 4. an ultrasonic liquid level sensor; 5. a discharge pipe; 6. a tee joint; 7. a water return pipe; 8. a manual flow regulating valve; 9. an observation tube; 10. an electric flow regulating valve I; 11. a water feeding pipe II; 12. a water feeding pipe I; 13. an electric flow regulating valve II; 14. a water tank; 15. a sewer pipe; 16. a self-suction height test well; 17. an electric submersible pump.
The spacing or dimensions between each other are exaggerated to show the location of the various parts, and the illustration is for illustrative purposes only.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
The terms "mounted", "connected", "fixed", and the like in the present invention should be understood broadly, and for example, the terms "mounted", "connected", "fixed", and the like may be fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As introduced in the background art, the present invention provides a self-priming performance testing system and method for a self-priming pump, in order to solve the above technical problems.
In an exemplary embodiment of the present invention, as shown in fig. 1, a self-priming performance testing system for a self-priming pump is provided, which can automatically measure a specified self-priming height and a self-priming time of the self-priming pump.
The testing system comprises a self-priming pump 3, a self-priming height testing well 16, a water tank 14, a submersible electric pump 17, a rotating speed sensor 2, an ultrasonic liquid level sensor 4, a controller and the like.
The self-priming pump 3 is arranged at the top of a well mouth of the self-priming height testing well 16, a water suction pipe 1 and a discharge pipe 5 are arranged on the self-priming pump 3, a water inlet of the self-priming pump 3 is communicated with the water suction pipe 1, and a water outlet of the self-priming pump 1 is communicated with the discharge pipe 5;
suction pipe 1 downwardly extending to from inhaling 16 bottoms of high test wells, be equipped with tee bend 6 on discharge pipe 5, tee bend 6's first route and discharge pipe 5 intercommunication, tee bend second route and wet return 7 intercommunication, wet return 7 downwardly extending to from inhaling 16 bottoms of high test wells, tee bend third route and observation tube 9 intercommunication, set up manual flow control valve 8 on the observation tube 9, observation tube 9 tip and water tank 14 intercommunication, manual flow control valve is used for flowing a small amount of water to the water tank through the observation tube, whether begin continuous water outlet with the observation pump outlet. The purpose of the water return pipe 7 is to return water sucked out of the self-priming pump from the self-priming height test well into the well through the water return pipe.
The water tank 14 may be fixed to the top of the wellhead of the self-priming height test well.
The ultrasonic liquid level sensor 4 is arranged above the self-priming height testing well, and the ultrasonic liquid level sensor 4 can monitor the liquid level position in the self-priming height testing well so as to measure the self-priming height of the self-priming pump; the ultrasonic liquid level sensor 4 can also adopt other liquid level sensors which can monitor liquid level.
When the height self-sucking test well is arranged, a support is arranged at the well mouth of the height self-sucking test well, and the ultrasonic liquid level sensor is arranged on the support of the well mouth of the height self-sucking test well.
The end part of the self-sucking pump 3 is provided with a rotating speed sensor 2 for measuring the rotating speed of the self-sucking pump; the deviation of the actual rotating speed from the specified rotating speed in the test should not exceed +/-3%.
A water feeding pipe I12 is further arranged in the self-priming height testing well 16, the water feeding pipe I12 extends upwards from the bottom of the self-priming height testing well, a submersible pump is arranged at the bottom of the water feeding pipe I12, a submersible pump 17 is adopted in the embodiment, the top of the water feeding pipe I12 is communicated with a water feeding pipe II 11, the water feeding pipe II 11 is communicated with a water tank 14, and an electric flow regulating valve I10 is arranged on the water feeding pipe II 11; the submersible electric pump is used for pumping water in the self-priming height test well to the water tank so as to realize the reduction of the water level of the self-priming height test well; and the electric flow regulating valve I is used for regulating the flow of the submersible electric pump.
The side part of the water tank 14 is also communicated with a sewer pipe 15, the sewer pipe 15 extends downwards to the bottom of a self-absorption height test well 16, and an electric flow regulating valve II 13 is arranged on the sewer pipe 15; the downcomer is used for with the rivers of water tank in to inhaling the high test well of high test well from inhaling to realize the rising of inhaling the high test well water level of high.
The rotating speed sensor 2, the ultrasonic liquid level sensor 4, the electric flow regulating valve I10, the electric flow regulating valve II 13 and the submersible electric pump 17 are all communicated with a controller, and the controller is communicated with a tablet personal computer.
The tablet personal computer controls the electric flow regulating valve I10, the electric flow regulating valve II 13 and the submersible electric pump 17 through a controller by a program, so that the liquid level height of the self-priming height test well is automatically regulated, the stability of the liquid level height is automatically maintained, and the measurement of the self-priming time at different self-priming heights is completed; data signals monitored by the rotating speed sensor 2 and the ultrasonic liquid level sensor 4 are transmitted to the tablet personal computer through the controller, and a self-priming performance curve of the tested self-priming pump is automatically drawn.
The test method of the present invention is described below, as shown in FIG. 2:
setting relevant parameters on the controller: the method comprises the steps of starting and stopping the submersible electric pump, and opening and closing and opening adjustment of an electric flow regulating valve I and an electric flow regulating valve II; the rotating speed sensor is used for measuring the rotating speed of the self-priming pump; the ultrasonic liquid level sensor is used for measuring the self-priming height of the self-priming pump;
the tablet personal computer controls the starting and stopping of the submersible electric pump, the opening and closing of the electric flow regulating valve I and the electric flow regulating valve II and the opening regulation through the controller, so that the self-priming height of the self-priming pump is adjusted, the stability of the liquid level is automatically maintained, the measurement of the self-priming time under different self-priming heights is completed, and the self-priming performance curve of the tested pump is drawn.
The specific test process is as follows:
starting the test, setting a self-priming height h according to a specified self-priming height h 'of the self-priming pump (h is smaller than the specified self-priming height h'); ultrasonic wave level sensor measures sensor position to inhale highly test well liquid level distance H certainly, is a by the distance of self priming pump shaft and ultrasonic wave level sensor position, calculates self priming pump shaft to inhale highly test well liquid level distance hi certainly: hi-H-a;
and comparing hi with h, and judging whether hi is within the range of h +/-a set value, wherein the set value in the embodiment is 30 mm: if hi is less than h-30mm, starting the submersible electric pump, pumping water to the water tank, reducing the liquid level height of the self-suction height test well, and then comparing hi with h again until h-30mm is less than or equal to hi and less than or equal to h +30 mm; if hi is larger than h +30mm, opening an electric flow regulating valve II, adding water from a water tank to the self-absorption height test well, raising the liquid level height of the self-absorption height test well, and then comparing hi with h again until h-30mm is larger than or equal to hi and is smaller than or equal to h +30 mm;
if h-30mm is less than or equal to hi and less than or equal to h +30mm, the submersible electric pump is shut down, the electric flow control valve II is closed, the self-priming pump is started, the self-priming process is started, the rotating speed sensor measures the rotating speed of the self-priming pump, timing is started when the rated rotating speed is reached, hi is measured, and hi is compared with h: if hi is larger than h +30mm, the electric flow regulating valve II is opened or the opening of the electric flow regulating valve II is increased, and the liquid level height of the self-absorption height test well is raised; if hi is less than h-30mm, the opening of the electric flow regulating valve II is reduced, and the liquid level height of the self-suction height test well is reduced; if h-30mm is not less than hi and not more than h +30mm, the opening of the electric flow regulating valve II is unchanged; when the self-priming pump normally discharges water (whether water normally discharges is judged, a manual flow regulating valve is in a normally open state, the opening degree of the manual flow regulating valve is small, and the manual flow regulating valve is only used for observing whether the self-priming pump normally discharges water), timing is stopped, the self-priming pump is shut down, and self-priming time measurement of the self-priming height is finished; the self-priming time under the self-priming height is the timing time in the testing process;
increasing the value of the self-priming height h, entering the test process for the second time, and measuring the self-priming time of the second self-priming height; the test is carried out for a plurality of times by the reciprocating circulation until the self-sucking pump can not discharge water normally, the self-sucking pump is stopped, and the test is finished; the maximum self-priming height of the self-priming pump to be tested is the h value when normal water is discharged in the last test, namely the maximum self-priming height of the self-priming pump is the maximum h value in the test capable of discharging water;
and finishing the measurement of the self-priming height and the self-priming time of the self-priming pump, and drawing a self-priming performance curve of the tested pump by taking the self-priming time as a horizontal coordinate and the self-priming height as a vertical coordinate.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The utility model provides a self priming pump is from inhaling capability test system which characterized by includes:
a self-suction height test well;
the water suction pipe extends upwards from the bottom of the self-priming height test well and is communicated with a water inlet of the self-priming pump;
the liquid level sensor is arranged above the self-suction height test well to monitor the liquid level position in the self-suction height test well; the liquid level sensor is in communication with a controller;
the top of the water tank is communicated with the self-absorption height testing well through an upper water pipe, and the side part of the water tank is communicated with the self-absorption height testing well through a lower water pipe so as to adjust the water level in the self-absorption height testing well;
the water feeding pipe comprises a water feeding pipe I communicated with the water tank, the water feeding pipe I is communicated with a water feeding pipe II, and the water feeding pipe II extends to the bottom of the self-absorption height testing well;
the bottom of the upper water pipe II is provided with a submersible pump, and the submersible pump is communicated with the controller;
the water feeding pipe I is provided with an electric flow regulating valve I, and the electric flow regulating valve I is communicated with the controller;
the sewer pipe is provided with an electric flow regulating valve II which is communicated with the controller;
the self-priming pump also comprises a discharge pipe, wherein the discharge pipe is communicated with a water outlet of the self-priming pump and is communicated with the water tank through an observation pipe;
the observation tube is provided with a manual flow regulating valve; the discharge pipe is also communicated with a water return pipe, and the water return pipe extends to the bottom of the self-absorption height testing well;
the testing method of the self-priming performance testing system of the self-priming pump comprises the following steps:
setting a self-priming height h, and obtaining the distance hi from the pump shaft of the self-priming pump to the liquid level of a self-priming height test well according to the monitoring value of the liquid level sensor;
comparing hi with h, starting the self-sucking pump when hi is within the range of h +/-a set value, starting timing when the self-sucking pump reaches a rated rotating speed, measuring hi again, stopping timing when hi is within the range of h +/-the set value again and water is discharged from the self-sucking pump, obtaining self-sucking time of the self-sucking height, and stopping the self-sucking pump;
increasing the value of the self-suction height h, repeating the above process, and performing a second self-suction height self-suction time measurement; the self-sucking pump is cycled in a reciprocating way and is tested for many times until the self-sucking pump can not discharge water, and the self-sucking pump is stopped;
and drawing a self-priming performance curve of the self-priming pump by taking the self-priming time as an abscissa and the self-priming height as an ordinate.
2. The self-priming performance testing system of claim 1 further comprising a speed sensor coupled to the self-priming pump, the speed sensor in communication with the controller for monitoring the speed of the self-priming pump.
3. The self-priming performance testing system of claim 1, wherein if hi is not within the range of h ± the set value, the water is pumped from or supplemented to the self-priming height testing well by the water tank to adjust the liquid level of the self-priming height testing well; the maximum self-priming height of the self-priming pump is the maximum h value in the test of water discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010728474.3A CN111963453B (en) | 2020-07-24 | 2020-07-24 | Self-priming performance test system and test method for self-priming pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010728474.3A CN111963453B (en) | 2020-07-24 | 2020-07-24 | Self-priming performance test system and test method for self-priming pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111963453A CN111963453A (en) | 2020-11-20 |
| CN111963453B true CN111963453B (en) | 2022-06-24 |
Family
ID=73362667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010728474.3A Active CN111963453B (en) | 2020-07-24 | 2020-07-24 | Self-priming performance test system and test method for self-priming pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111963453B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112943629B (en) * | 2021-03-12 | 2022-05-27 | 江苏鑫源烟草薄片有限公司 | High-temperature-resistant automatic water pumping method for steam thermal well |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2031461U (en) * | 1988-04-07 | 1989-01-25 | 重庆大学 | Energy-saving self-suction device used for pump and pump assembly |
| SU1731989A1 (en) * | 1989-07-09 | 1992-05-07 | Барнаульский станкостроительный завод | Stand for testing self-priming pump |
| ITFI20010116A1 (en) * | 2001-06-26 | 2002-12-26 | Romeo Ramacciotti | SELF-PRIMING CENTRIFUGAL PUMP |
| CN102913463B (en) * | 2012-05-09 | 2014-12-17 | 江苏大学 | Self-priming height test bed for self-priming pump with high priming travel |
| CN106194778B (en) * | 2016-07-25 | 2018-06-01 | 江苏大学 | A kind of novel experiment device and test method for measuring self priming pump self-priming performance |
-
2020
- 2020-07-24 CN CN202010728474.3A patent/CN111963453B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111963453A (en) | 2020-11-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111963453B (en) | Self-priming performance test system and test method for self-priming pump | |
| CN106979162A (en) | Pump closed testing bench control system and method for testing | |
| CN106968934A (en) | Pump cavitation surplus Auto-Test System and its method | |
| CN103061384B (en) | Secondary-pressurizing energy-saving water-supply system for high-rise building and energy-saving water supply method | |
| CN108980025B (en) | Water pump performance comprehensive test board | |
| KR101885272B1 (en) | Flocculation agitator with adjusting function of water level | |
| CN106390786A (en) | Micro-nano bubble generator | |
| CN215539908U (en) | Proportioning device for on-line monitoring of emulsion concentration | |
| CN107219869A (en) | A kind of automatic emulsion proportioning control method and system | |
| CN219492598U (en) | High-lift pumping device | |
| JP2008267080A (en) | Water supply system | |
| CN107747548A (en) | A kind of vertical axially suction centrifugal pump semi-submersible type waterpower test device | |
| CN214552870U (en) | A pH value adjusting device for tropisetron hydrochloride | |
| CN112983350B (en) | Wellhead back pressure regulation and control method and device | |
| CN218995361U (en) | Flow stabilizing device for pumping test | |
| CN205668101U (en) | Vertical saw automatically control water circulation system | |
| CN210949087U (en) | Water pump performance detection platform | |
| KR101407652B1 (en) | A pump having buoyancy guide | |
| CN109162910B (en) | Cargo oil pump performance testing device and testing method | |
| CN106194778B (en) | A kind of novel experiment device and test method for measuring self priming pump self-priming performance | |
| CN107676997B (en) | Geothermal well recharging device | |
| CN217582461U (en) | Water pump energy-saving control system | |
| CN217421549U (en) | Self priming pump test bench | |
| CN209955514U (en) | Printing ink viscosity controller | |
| CN114704477B (en) | Self-priming height testing device and method for self-priming pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |